Refs #18586 -- Split out long custom_columns lookup test into multiple tests.

tests/custom_columns/tests.py

@@ -8,66 +8,71 @@ from .models import Author, Article
 
 
 class CustomColumnsTests(TestCase):
-    def test_db_column(self):
+    def setUp(self):
         a1 = Author.objects.create(first_name="John", last_name="Smith")
         a2 = Author.objects.create(first_name="Peter", last_name="Jones")
 
         art = Article.objects.create(headline="Django lets you build Web apps easily")
         art.authors = [a1, a2]
 
-        # Although the table and column names on Author have been set to custom
-        # values, nothing about using the Author model has changed...
+        self.a1 = a1
+        self.art = art
 
-        # Query the available authors
+    def test_query_all_available_authors(self):
         self.assertQuerysetEqual(
             Author.objects.all(), [
                 "Peter Jones", "John Smith",
             ],
             six.text_type
         )
+
+    def test_get_first_name(self):
+        self.assertEqual(
+            Author.objects.get(first_name__exact="John"),
+            self.a1,
+        )
+
+    def test_filter_first_name(self):
         self.assertQuerysetEqual(
             Author.objects.filter(first_name__exact="John"), [
                 "John Smith",
             ],
             six.text_type
-        )
-        self.assertEqual(
-            Author.objects.get(first_name__exact="John"),
-            a1,
+
         )
 
+    def test_field_error(self):
         self.assertRaises(FieldError,
             lambda: Author.objects.filter(firstname__exact="John")
         )
 
-        a = Author.objects.get(last_name__exact="Smith")
-        a.first_name = "John"
-        a.last_name = "Smith"
+    def test_attribute_error(self):
+        with self.assertRaises(AttributeError):
+            self.a1.firstname
 
-        self.assertRaises(AttributeError, lambda: a.firstname)
-        self.assertRaises(AttributeError, lambda: a.last)
+        with self.assertRaises(AttributeError):
+            self.a1.last
 
-        # Although the Article table uses a custom m2m table,
-        # nothing about using the m2m relationship has changed...
-
-        # Get all the authors for an article
+    def test_get_all_authors_for_an_article(self):
         self.assertQuerysetEqual(
-            art.authors.all(), [
+            self.art.authors.all(), [
                 "Peter Jones",
                 "John Smith",
             ],
             six.text_type
         )
-        # Get the articles for an author
+
+    def test_get_all_articles_for_an_author(self):
         self.assertQuerysetEqual(
-            a.article_set.all(), [
+            self.a1.article_set.all(), [
                 "Django lets you build Web apps easily",
             ],
             lambda a: a.headline
         )
-        # Query the authors across the m2m relation
+
+    def test_get_author_m2m_relation(self):
         self.assertQuerysetEqual(
-            art.authors.filter(last_name='Jones'), [
+            self.art.authors.filter(last_name='Jones'), [
                 "Peter Jones"
             ],
             six.text_type